Improvement in pencil-cases



1. HOLLAND.

% I Pencil-Bases.

N0.157,826, Patented 099.111 2374.

Fig. 1.

- Ki/f e st THE GRAPHIC cO F"OTO-L!TH.39& I PARK PLACEJLY.

UNITED STATES PATENT OFFICE JOHN HOLLAND, OF CINCINNATI, OHIO.

IMPROVEMENT lN PENCIL-CASES.

Specification forming part of Letters Patent No. 157,826, dated December 15, 1574; application filed October 8, 1874.

To all whom it may concern:

Be it known that 1, JOHN HOLLAND, of the city of Cincinnati, Hamilton county, State of Ohio, have invented a certain new and useful Improvement in PenciLOases, of which the following is a specification:

This invention relates to that class of pencilcases consisting of telescopic shells, combined with each other in such a manner that, by extending the holder, the tip is advanced to its working position, and by pushing in the same the tip is retracted.

My improvement consists in providing a cylinder which is spirally grooved externally and internally, the one being a right and the other alet't hand spiral, and journaling the same between collars upon a tube with a straight slot, the whole to slide in another tube with a slot through part of its length, and arranging suitable pins to slide in these slots and grooves, so as to produce a smooth even movement in extending the case, thus avoiding the friction produced by one spirally-slotted tube sliding within another.

Figure l is the case extended in its working position. Fig. 2 is the casein its retracted position. Fig. 3 is an enlarged axial section of the operative parts of the pencil-case in its protruded position. Figs. 4, 5, 6, and 7 are the same parts detached.

0 is the outer cylinder, having a slot, j, through parts of its length, in which the pin )1. slides, and a pin, g, projectinginwardly near the front end to slide in the external spiral groove and revolve the cylinder 61, when the case is extended or retracted. bis the journal upon which the tube d revolves, with the collars c and 0 upon it, and a slot, 2', through part of its length, through which the pin f, from the tube 6, passes, to engage in the internal spiral groove in the cylinder 01. The slot 1' is extended at a right angle at its front, so that when the tip is extended the pin f will slip into this ofl'set, and lock the tip so it will not slide back when in use. d is the spirally grooved cylinder, the internal spiral being shown in dotted lines in Fig. 6. e is the inner tube, to the front end of which the tip is attached. f is the pin fixed in the tube 0, by which the said tube is moved back and forward as the cylinder at is revolved. g is a pin attached to the tube a, and projecting inwardly into the spiral groove in the cylinder d, by means of which the cylinder d is revolved, when the tube a is slipped forward or back. It is a pin fixed in the collar 0, and projecting through the slot j, to prevent the tube 1) and its collars c and c from revolving. The outer shells are attached in the usualway-that is, the outside one to the front of the tube Z), and the collar 0 and the one that slides into it to the tube a.

I claim- 1. In combination with a pencil-case, the cylinder 01 with an external and internal spiral groove, the one being a right and the other a left hand spiral, substantially as shown and described.

2. In combination, the tube a, having pin 1, tube 1), provided with the slot 6, and collars c and c, and tube 6, furnished with pin f, with the double spiral cylinder d, substantially as shown and described.

JOHN HOLLAND. 

